Stator-plate adjustment for variable condensers



Jan. a, 192& msam E. Ross v STATOR PLATE ADJUSTMENT FOR VARIABLE CONDENSERS Original Filed Feb.25, 1925 ATTORNEY Patented Jan. 3, 1928.

UNITED STATES 1,555,109 PATENT caries.-

ERNEST BOSS, or nesr ORANGE, NEW JERSEY, ASSIGNOB,

BY MESNE ASSIGNMENTS;

. .ro RADIO coNnnNsnn COMPANY, or cAMnEN, NEW JERSEY, A coRronA'rroN or NEW JERSEY.

' 'srnron-rna'rn ADJUSTMENT non. VARIABLE CONDENSELRS.

Application filed February 23, 1926, Serial No. 89,845. Renewed November 28, 1927.

1 This invention relates to variable condensers as used in connection with radio apparatus receiving sets and more specifically to the stator plates used therein.

Variable condensers of this type ordinarily consist of. a rigid frame firmly held within a cabinet and in which is fixed a plurality of stator plates arranged in uniformly spaced relation. I c ltnterposed between each pair of stator plates is a rotor plate, all of the rotor plates being fixed on 'a shaft and actuated 'bya manually operable knob to move the rotor platesradially relative to 15 the stator plates, and means are sometimes provided to shift the shaft, or the rotor plates thereon, laterally with reference to the stator plates to cause centralization therebetween. v L

Such shifting devices are necessarily quite complicated, inconvenient to adjust, due to their practical inaccessibility, and are therefore neglected notwithstanding the necessity of a uniform air gap between the several plates in order to obtain the best results.

It is an object of the present invention to eliminate the necessity of laterally adjusting the rotor plates, permitting them to be fixedly secured in proper spaced relation on their spindle, and'also obviating any requirement for longitudinal adjustment of thespindle to accomplish the same purpose.

. it is a further feature to permit the permanent, fixed installation of a stator plate frame within a cabinet, means being provided in the frame'for shifting the group of previously assembled stator plates, as a unit, laterally in either direction con-formably with respect to the rotor plates. I

Another aim is toprovide a simple, ef fective and easily operated device for adjusting the stator plates without affecting their support frame in any respect,

These and lesser important objects are accomplished by the novel and practical con- I struction, arrangement and combination of few and simple parts hereinafter described and delineated in the associated drawing, constituting amaterial part of this dis- Figure 1 is atop plan view of a variable condenser made in accordance with the in vention, the rotor elements being omitted.

or mandrel controlled Figure 2 is alongitudinal sectional view taken on 1316 2-2 of Figure l.

F1gure 3 is a transverse sectional view taken on line 33'of F igure 1.

Figure 4; is a perspectlve View of of parts used in the structure, detail.

In common with other variable condensers the support frame consists'of upright plates 10 and 11, having ordinary means, not shown, for attachment to the Wall of a cabinet. v

These frame plates are maintained in fixed spaced relation by a series of metal tubes 12 uniform in length and having their'ends squarely cut to contact with the inner faces of the plates. The stator plates 13 consist of a single continuous strip of metal stamped to produce a plurality of identical profiles bent at their connected ends to produce a series of integrally united plates.

The profiles of these several plates 13 include recesses lt near one end in their up per edges in which the rotor plate carrying spindle may enter, the rotor plates being shown in broken lines and designated by the numeral 15.

Extending from the opposite convex edges of the stator plates are lugs 16' having registering openings through which pass} ropils 17 provided with screw threads at each en A series of spacers 18 are arranged intermediate the plates on the rods 17 these spacers being uniform in thickness and make intimate contact with the lug surfaces, the plates and spacers being clamped between nuts 19 adjustable on the ends of the rods 17.

The tubes 12 are cut away on one side intermediate their ends, as at 20, and are of such internal diameter as to receive the lugs 16, spacers 18 and'nuts 19 through the recess '20, the nuts 19, preferably hexagonal on their exteriors, extending past the cut-' out recess into the ends of the tubes, as best seen in Figure 3, but do not reach to the plates 10 and 11, spaces 21 intervening.

The tubes 12 are held in position etween the support plates 10 and 11 by screws 22 passing through openings in the plates and engaging the outer ends ofthe nuts 19, the engaged heads of the screws impinging a group shown in tes.

It will be understood from the foregoing -v that the stator plates rods 17 may be assem led and held by the 13, spacers .18 and nuts 19 within the tubes 12, and that these elements are entered as a unit between the the air space between them, it may be easily slackening. the clamp screws on the side it is desired to move from,

accomplished by plates; 10 and 11 to receive the screws 22,

(their heads clamping the structure firmly tol0 gether.

If it be desired to adjust the stator plates 13'relative to the rotor plates 15, to equalize as for-instance, the. support plate 10, and

' tighten the screvys 22fat the other sidell,

drawing the unit? in'the direction of the arrow shown in full lines in Figure 3, the L several parts moving r'ree'ly within thetubes.

12 which remain stationary.

Obviously-a resultant movement in the op of condenser COIlStIllCtlOIL' Thus a positive ad ustment of the stator plates is-readily obtained within suchlimits as is desirableandthe same is accomplishedin an easy-manner, while the rotor plates are ,maintained in the integrity of their original a mbly, I Although I have described my improve- -ments with considerable {detail and with res'pect to certain detail forms of my invention,'I do not desire tobe limited to such de- 'may 1 l the s iritand scope of my invention in its broa est as ect.

tails since many changes and modifications well be made without departing from Having t as described myi-nvention, what I claimas new and desire secure by Letters Patent, ist-F- 1 v against'the outer surfaces of the support P rigid supports rods binding the 1. variable condenser including a plu -rality of rods, a plurality of stator plates assembled as a umt on said rods, tubesin which said rods are slidably. enveloped, said tubes having. recesses .tdreceivesaid rods, between which the unit is mounted, and means to shift the unit laterally between the supports lengthwise within the tubes.

2. A variable condenser including a plurality'of stator plates, rods on which said plates are mounted, saidfrods being threaded at their ends, spacers onf mediate said, plates, elongated nuts on-said rods for clamping the-plates and spacers,

said rods inter- I spaced supports for said plates, and-screws passing through'said supports-to engage said nuts for adjustin said rods len hwise 'therebetween where y shifting of sai plates is accomplished.

3; A variable condenser including a plurality of stator plates, plates are mounted,..spacers on'said 'rods rods on which said intermediate said plates, nutsior clamping I the plates and spacers on said rods, tubes partially enveloping saidrods, 'rigid supports held in spaced relation by saidtubes,

and screws passing through 'saidsupports.

to engage said means whereby" said plates may be shifted laterally.

,4. In a variable condenser havin and stator plates, said stator plates. aving perforate projections, rods passing through x v said pro ections, spacers on said rods between adjacent plates, clamp nuts on-said plates'and spacers into a unit,,said nuts extending beyond the .rods, tubes having spacers and plate projections, supports 5 aced by said. tubes, and screws passing trough said supports -to engage in the extending ends of said nuts, whereby the plate units may be moved laterally, with-reference to said rotor lates. e v I This speci cation signed this 8th day of February, 1926,,

ERNEST ROSS.

recesses to receive said rods, 

